CN108601158B - A kind of linear constant current LED lamp circuit - Google Patents
A kind of linear constant current LED lamp circuit Download PDFInfo
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- CN108601158B CN108601158B CN201810651967.4A CN201810651967A CN108601158B CN 108601158 B CN108601158 B CN 108601158B CN 201810651967 A CN201810651967 A CN 201810651967A CN 108601158 B CN108601158 B CN 108601158B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
- H05B45/397—Current mirror circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/19—Controlling the light source by remote control via wireless transmission
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Computer Networks & Wireless Communication (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of linear constant current LED lamp circuits.The linear constant current LED lamp circuit can change according to the automatic height for adapting to input voltage of variation of special constant-current circuit and LED serial number, make the total voltage of LED always close to input voltage, to reduce the voltage drop of constant current tube and reduce the power loss of constant current tube, energy-efficient purpose is reached；The special constant-current circuit makes LED operation within the scope of rated current, will not overcurrent cause to damage；Resistance by the way that n grades of special constant-current circuits are arranged successively decreases variation, reach the incremental variations of n grades of special constant-current circuital currents, to enable the operating current of circuit to follow input voltage, therefore circuit power factor with higher and lower harmonic distortion, electrical property are good.
Description
Technical field
The present invention relates to LED control technology fields, more particularly to a kind of linear constant current LED lamp circuit.
Background technique
There are many LED (Light Emitting Diode, light emitting diode) lamps for using linear constant current scheme, line at present
Property constant current scheme eliminate Switching Power Supply, the service life is longer, structure is simple, integrated with LE D lamp bead can be assembled into lamp plate.
Naturally compatible silicon controlled device realizes controllable silicon light modulation to linear constant current scheme, but dimming effect is influenced very by controllable silicon dimmer
Greatly, on the market controllable silicon dimmer kind is numerous, dimming mode prolongs before being also classified into, after prolong etc. it is a variety of, controllable silicon dimmer with
The cooperation of linear constant current LED be not generally it is very good, dimming ratio and the linearity are all poor, to reach more satisfactory light modulation effect
There is still a need for use external dimmer, such as wifi light modulation, 0-10V light modulation for fruit.But these external dimmer modes and linear constant current LED
None unified interface standard of lamp generally uses PWM (Pulse Width for the linear constant current scheme of single-stage
Modulation, pulse width are modulated) analog quantity is then converted to by Phototube Coupling to adjust the size of continuous current, thus real
It now dims, circuit is complex, and can not dim to using the scheme of constant current integrated circuit；Multistage higher for performance
Linear constant current scheme then realizes that external dimmer of good performance is more difficult, the scheme of rarely found maturation.As it can be seen that existing linear perseverance
The generally existing performance of normal linear constant current scheme that stream LED light uses is poor, low efficiency, light efficiency is low, power factor is low, harmonic wave is high
Problem.
Summary of the invention
The object of the present invention is to provide a kind of linear constant current LED lamp circuit, there is simple route, High Power Factor, low humorous
The characteristics of wave, high efficiency, high photosynthetic efficiency.
To achieve the above object, the present invention provides following schemes:
A kind of linear constant current LED lamp circuit, comprising: n special constant-current circuit；Wherein, k-th of special constant-current circuit
With first voltage input terminal Vka and second voltage input terminal Vkb；K-th of special constant-current circuit include field-effect tube Tk,
Triode Qk, first resistor Rka, second resistance Rkd and LED light LEDk；In the n special constant-current circuit, -1 institute of kth
The second voltage input terminal Vkb of the cathode and k-th of special constant-current circuit of stating the LED light LEDk-1 of special constant-current circuit connects
It connects；The of first voltage input terminal V (k-1) a of kth -1 special constant-current circuit and k-th of special constant-current circuit
One voltage input end Vka connection；The source electrode of the field-effect tube Tk-1 of kth -1 special constant-current circuit and k-th it is described specially
With the emitter connection of the triode Qk of constant-current circuit；The resistance of second resistance R (k-1) d of kth -1 special constant-current circuit
Value is greater than the resistance value of the second resistance Rkd of k-th of special constant-current circuit；Wherein 1≤k≤n.
Optionally, in k-th of special constant-current circuit, it is defeated that the anode of the LED light LEDk connects the second voltage
Enter and hold Vkb, cathode connects the drain electrode of the field-effect tube Tk；It is defeated that one end of the first resistor Rka connects the first voltage
Enter and hold Vka, the other end connects the grid of the field-effect tube Tk；One end of the second resistance Rkd connects the field-effect tube
The source electrode of Tk, the other end connect the emitter of the triode Qk；The collector of the triode Qk connects the field-effect tube
The grid of Tk；The base stage of the triode Qk connects the source electrode of the field-effect tube Tk.
Optionally, k-th of special constant-current circuit further include: tertiary voltage input terminal Vkd；The base of the triode Qk
Pole is connect with the tertiary voltage input terminal Vkd
Optionally, the linear constant current LED lamp circuit further include: rectifier bridge stack；
First connecting pin of the rectifier bridge stack is connect with electric main firewire incoming end；The second of the rectifier bridge stack connects
End is connect to connect with the second voltage input terminal V1b of first special constant-current circuit in the n special constant-current circuit；It is described whole
The third connecting pin of stream bridge heap is connect with electric main zero curve incoming end；4th connecting pin of the rectifier bridge stack and the 1st institute
State the emitter connection of the triode Q1 of special constant-current circuit.
Optionally, the linear constant current LED lamp circuit further include: fuse and varistor；
One end of the fuse connects the electric main firewire incoming end, and the other end connects the of the rectifier bridge stack
One connecting pin；One end of the varistor connects the first connecting pin of the rectifier bridge stack, and the other end connects the rectifier bridge
The third connecting pin of heap.
Optionally, k-th of special constant-current circuit also has the 4th voltage input end Vkc；And k-th of dedicated perseverance
Current circuit further include: 3rd resistor Rkb and the 4th resistance Rkc；
Wherein one end of the 3rd resistor Rkb connects the base stage of the triode Qk, and the other end connects the field-effect
The source electrode of pipe Tk；One end of the 4th resistance Rkc connects the base stage of the triode Qk, and the other end connects the 4th voltage
Input terminal Vkc
Optionally, in the n special constant-current circuit, the 4th voltage input end V of kth -1 special constant-current circuit
(k-1) c is connect with the 4th voltage input end Vkc of k-th of special constant-current circuit.
Optionally, k-th of special constant-current circuit further include: capacitor Ck, resistance R2k, resistance R5k and resistance R6k；
One end of the capacitor Ck connects the grid of the field-effect tube Tk, and the other end connects the base of the triode Qk
Pole；The emitter of one end connecting triode Qk of the resistance R2k of k-th of special constant-current circuit, the other end connect kth -1
The source electrode of the field-effect tube Tk of the special constant-current circuit；One end connection three of the resistance R21 of the 1st special constant-current circuit
The emitter of pole pipe Q1, the other end connect the 4th connecting pin of the rectifier bridge stack；One end of the resistance R5k passes through described the
Four resistance Rkc are connect with the base stage of the triode Qk, and the other end passes through the second resistance Rkd's and field-effect tube Tk
Source electrode connection；One end of the resistance R6k is connect by the 4th resistance Rkc with the base stage of the triode Qk, the other end
As external voltage input terminal Uk；The external voltage input terminal Uk-1 of kth -1 special constant-current circuit and k-th it is described specially
With the external voltage input terminal Uk connection of constant-current circuit.
Optionally, the linear constant current LED lamp circuit further include: wifi light adjusting circuit；The wifi light adjusting circuit difference
It is connect with the external voltage input terminal Uk of the k special constant-current circuits.
Optionally, the wifi light adjusting circuit includes: wifi light modulator, resistance Rb1-Rb9, photoelectrical coupler, capacitor
Cb1-Cb5, the first operational amplifier and second operational amplifier；
Wherein the first connecting pin of the photoelectrical coupler connects the PWM of the wifi light modulator by the resistance Rb1
Signal output end；The second connection end of the photoelectrical coupler is grounded；The resistance Rb2 is connected in parallel on the of the photoelectrical coupler
Between one connecting pin and second connection end；Shunt capacitance between the third connecting pin and the 4th connecting pin of the photoelectrical coupler
Cb1；One end of the resistance Rb3 connects the 5th voltage input end, and the other end connects the 4th connecting pin of the photoelectrical coupler；
One end of the resistance Rb8 connects the 4th connecting pin of the photoelectrical coupler, and the other end passes through the resistance Rb9 and described the
The first input end of one operational amplifier connects；It is put by the resistance Rb9 and first operation one end of the capacitor Cb3
The first input end connection of big device, the other end are connect with the second input terminal of first operational amplifier；The capacitor Cb4's
One end is connect with the first input end of first operational amplifier, and the third connecting pin of the other end and the photoelectrical coupler connects
It connects；One end of the resistance Rb4 connects the output end of first operational amplifier, and the other end passes through the resistance Rb5 and institute
State the third connecting pin connection of photoelectrical coupler；One end of the resistance Rb7 connects the resistance Rb4, described in other end connection
The first input end of second operational amplifier；Second input terminal of the second operational amplifier passes through the resistance Rb5 and institute
State the third connecting pin connection of photoelectrical coupler；It is second defeated to connect the second operational amplifier for one end of the resistance Rb6
Enter end, the other end connects the output end of the second operational amplifier；One end of the capacitor Cb5 connects second operation and puts
The output end of big device, other end ground connection；The output end of the second operational amplifier and k-th special constant-current circuit it is outer
Portion's voltage input end Uk connection.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
A kind of linear constant current LED lamp circuit provided by the invention, can be according to special constant-current circuit and LED serial number
The automatic height variation for adapting to input voltage of variation, makes the total voltage of LED always close to input voltage, to reduce constant current tube
Voltage drop and reduce the power loss of constant current tube, reached energy-efficient purpose；The special constant-current circuit makes LED operation
Within the scope of rated current, will not overcurrent cause to damage；Resistance by the way that n grades of special constant-current circuits are arranged successively decreases variation, reaches n
The incremental variations of grade special constant-current circuital current, to enable the operating current of circuit to follow input voltage, therefore the circuit has
There are higher power factor and lower harmonic distortion, electrical property is good.
In addition, can further improve circuit by increasing the concatenated quantity of LED and corresponding special constant-current circuit quantity
Efficiency and power factor reduce harmonic distortion.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of overall structure diagram of linear constant current LED lamp circuit provided by the invention；
Fig. 2 is the structural schematic diagram of k-th of special constant-current circuit provided by the invention；
Fig. 3 is the structural schematic diagram of linear constant current LED lamp circuit specific embodiment one provided by the invention；
Fig. 4 is a kind of structural schematic diagram of special constant-current light adjusting circuit provided by the invention；
Fig. 5 is the structural schematic diagram of linear constant current LED lamp circuit specific embodiment two provided by the invention；
Fig. 6 is the structural schematic diagram of linear constant current LED lamp circuit specific embodiment three provided by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of linear constant current LED lamp circuit, there is simple route, High Power Factor, low humorous
The characteristics of wave, high efficiency, high photosynthetic efficiency.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is a kind of overall structure diagram of linear constant current LED lamp circuit provided by the invention.Referring to Fig. 1, the present invention
A kind of linear constant current LED lamp circuit provided includes: n special constant-current circuit, n >=1 and be integer.Wherein, k-th it is described specially
There is first voltage input terminal Vka and second voltage input terminal Vkb with constant-current circuit.K-th of special constant-current circuit include
Field-effect tube Tk, triode Qk, first resistor Rka, second resistance Rkd and LED light LEDk.The n special constant-current circuit
In, the second electricity of the cathode of the LED light LEDk-1 of kth -1 special constant-current circuit and k-th of special constant-current circuit
Press input terminal Vkb connection.First voltage input terminal V (k-1) a of kth -1 special constant-current circuit and k-th it is described dedicated
The first voltage input terminal Vka connection of constant-current circuit.The source electrode of the field-effect tube Tk-1 of kth -1 special constant-current circuit with
The emitter of the triode Qk of k-th of special constant-current circuit connects.The second resistance of kth -1 special constant-current circuit
The resistance value of R (k-1) d is greater than the resistance value of the second resistance Rkd of k-th of special constant-current circuit.Wherein 1≤k≤n and k are whole
Number.
In k-th of special constant-current circuit, the anode of the LED light LEDk connects the second voltage input terminal Vkb,
Cathode connects the drain electrode of the field-effect tube Tk；One end of the first resistor Rka connects the first voltage input terminal Vka,
The other end connects the grid of the field-effect tube Tk；One end of the second resistance Rkd connects the source electrode of the field-effect tube Tk,
The other end connects the emitter of the triode Qk；The collector of the triode Qk connects the grid of the field-effect tube Tk；
The base stage of the triode Qk connects the source electrode of the field-effect tube Tk.
K-th of special constant-current circuit further include: tertiary voltage input terminal Vkd；The base stage of the triode Qk and institute
State the Vkd connection of tertiary voltage input terminal.
The linear constant current LED lamp circuit further include: rectifier bridge stack B1.The first connecting pin 1 of the rectifier bridge stack B1 with
Electric main firewire incoming end ACL connection；In the second connection end 2 of the rectifier bridge stack B1 and the n special constant-current circuit
First special constant-current circuit the V1b connection of second voltage input terminal；The third connecting pin 3 of the rectifier bridge stack B1 with exchange
Alternating current zero curve incoming end ACN connection；The 4th connecting pin of the rectifier bridge stack B1 and three poles of the 1st special constant-current circuit
The emitter of pipe Q1 connects.The 4th connecting pin ground connection of the usual rectifier bridge stack B1.
In addition, the linear constant current LED lamp circuit further include: fuse FUSE and varistor VAR.The fuse
One end of FUSE connects the electric main firewire incoming end ACL, and the other end connects the first connecting pin of the rectifier bridge stack B1
1.One end of the varistor VAR connects the first connecting pin 1 of the rectifier bridge stack B1, and the other end connects the rectifier bridge stack
The third connecting pin 3 of B1.
A kind of linear constant current LED lamp circuit provided by the invention, can be according to the variation of special constant-current circuit serial number
The automatic height variation for adapting to input voltage, makes the total voltage of LED always close to input voltage, to reduce the electricity of constant current tube
Pressure drop and the power loss for reducing constant current tube, have reached energy-efficient purpose；The special constant-current circuit makes LED operation in volume
Within the scope of constant current, will not overcurrent cause to damage；Resistance by the way that n grade special constant-current circuits are arranged successively decreases variation, reach n grades it is special
With the incremental variations of constant-current circuit electric current, so that the operating current of circuit be enable to follow input voltage, therefore the circuit have compared with
High power factor and lower harmonic distortion, electrical property is good.
Below by taking k-th of special constant-current circuit as an example, further details of theory is made to the principle of the present invention and advantage
It is bright.Fig. 2 is the structural schematic diagram of k-th of special constant-current circuit provided by the invention.Referring to fig. 2, dedicated perseverance of the present invention
Current circuit is made of field-effect tube Tk, triode Qk, resistance Rka, resistance Rkd and load LEDk.The special constant-current circuit
Constant current principle be flow through load LEDk electric current also flow through MOS (metal oxide semiconductor) pipe Tk and sampling electricity
Hinder Rkd, the pressure drop on sample resistance Rkd is also the bias of triode Qk base stage simultaneously, and Qk collector is connected with Tk grid, Qk with
Tk forms the pressure drop on the stable Rkd of negative-feedback circuit, has achieved the purpose that steady load LEDk electric current, to form constant-current source electricity
Road.
The course of work of the special constant-current circuit are as follows: when A point to C point voltage increases-load LEDk electric current increase-
Also increase-the operating point Qk raising-Qk collector voltage decline-Tk bias voltage decline-Tk internal resistance is increased-is born for Rkd pressure drop
The decline of LEDk electric current is carried, the electric current of load LEDk is stabilized by this close loop negative feedback process, even if A in a certain range
Point voltage change, the electric current of LEDk are also able to maintain stabilization.The constant current size of the special constant-current circuit is by the linear of triode Qk
The decision of the resistance value of magnification region base voltage (about 0.6V) and sample resistance Rkd, relationship are as follows: continuous current I=0.6/
Rkd。
Wherein voltage+Vka and voltage+Vkb is external voltage, and voltage+Vka and voltage+Vkb can be by when practical application
The same power voltage supply, size are related with resistance Rka and load LEDk.The effect of resistance Rka is to provide biased electrical for metal-oxide-semiconductor
Pressure, value range can be very big.Setting varistor VAR be in order to protect the linear constant current LED lamp circuit avoid by
The damage of surge voltage.
The special constant-current circuit is also a controlled switch simultaneously, when B point is not injected into external voltage+Vkd, circuit constant current
Source working condition is unaffected；When B point injects external voltage+Vkd, if injecting voltage is sufficiently large, greater than the line of triode Qk
Property magnification region base voltage (about 0.6V), Injection Current is sufficiently large (greater than the Constant Electric Current set by sample resistance Rkd at this time
I is flowed, that is, is greater than 0.6/Rkd), keep the voltage on sample resistance Rkd sufficiently high, reaching makes Qk deviate linear magnification region to completely
Conducting is even saturated, and Tk grid voltage is pulled low to operating point hereinafter, to make Tk end by Qk.
As it can be seen that can control the special constant-current circuit to convert between constant-current source and switch by controlling B point injecting voltage,
Realize controlled switch function.
Illustrate this hair by taking the linear constant current LED lamp circuit being made of 3 special constant-current circuits as an example again below
The working principle and advantage of open-wire line constant current LED lamp circuit.
Fig. 3 is the structural schematic diagram of linear constant current LED lamp circuit specific embodiment one provided by the invention.Referring to Fig. 3,
As a kind of specific embodiment, linear constant current LED lamp circuit provided by the invention includes 3 special constant-current circuits, i.e. n=3.
Its working principle is that: mains voltage becomes the direct current of fluctuation after rectifier bridge stack B1, according to the positive half cycle of sine wave
Rule repeats to change, and voltage is constantly pressed sinusoidal rule and increased from zero to wave crest, then declines from wave crest to zero by sinusoidal rule, such as
This moves in circles.Assuming that the voltage of LED1, LED2, LED3 are respectively U1, U2, U3, and U1+U2+U3 is less than line voltage peak
Value enables R1d > R2d > R3d, can set T1, T2, T3 in special constant-current circuit by setting the resistance value of R1d, R2d, R3d
Continuous current is incremented by, i.e. T3 continuous current > T2 continuous current > T1 continuous current.
When input voltage cyclically-varying, the course of work of the linear constant current LED lamp circuit are as follows:
1, when input voltage is greater than U1 and is less than U1+U2, constant-current source T1 work, LED1 conducting shines；
2, when input voltage is greater than U1+U2 and is less than U1+U2+U3, constant-current source T2 work, hair is connected in LED1 and LED2
Light；Due to the current sampling resistor of the electric current injection constant-current source T1 of constant-current source T2, and the operating current of constant-current source T2 is greater than constant current
The operating current of source T1, according to controlled switch principle noted earlier, T1 ends at this time, and no electric current flows through T1 therefore not will cause
Additional power loss, LED1 and LED2 series connection, LED voltage are increased with the raising of input voltage at this time；
3, when voltage is greater than U1+U2+U3, constant-current source T3 work, LED1, LED2, LED3, which are connected, to shine, with above-mentioned original
The electric current for managing constant-current source T3 at this time injects T2 and T1, therefore T1, T2 end, and electric current flows only through LED1, LED2, LED3 and T3, do not have
Have electric current by T2, T1, therefore not will cause additional power loss, LED1, LED2 and LED3 connect at this time, LED voltage into
One step is increased with the raising of input voltage.
4, the decline of input voltage is that the inverse process of the above process repeats.
Similarly, one, two and four or more special constant-current circuit can form above-mentioned line according to the topology of Fig. 3
Property constant current LED lamp circuit, working principle is identical, LED go here and there number and corresponding special constant-current source circuit is more, performance of circuit more
It is good.
It can be seen that using the special constant-current circuit, load LED lamp can pass through the variation of special constant-current circuit serial number
The automatic height variation for adapting to input voltage, makes the total voltage of LED always close to input voltage, this reduces constant current tubes
Voltage drop and the power loss for reducing constant current tube, have reached energy-efficient purpose.Meanwhile special constant-current circuit makes LED operation
Within the scope of rated current, will not overcurrent cause to damage.In addition, the current increase variation for passing through n grades of special constant-current circuits of setting
The operating current of circuit is set to follow input voltage, therefore linear constant current LED lamp circuit function with higher provided by the invention
Rate factor and lower harmonic distortion, electrical property is good, by increasing the concatenated quantity of LED and corresponding special constant-current circuit number
Amount can also further increase the efficiency and power factor, reduction harmonic distortion of circuit.
It is formed the present invention also provides a kind of special constant-current light adjusting circuit and by the special constant-current light adjusting circuit linear
Constant-current dimming LED lamp circuit.Fig. 4 is a kind of structural schematic diagram of special constant-current light adjusting circuit provided by the invention.Referring to fig. 4,
By taking k-th of special constant-current light adjusting circuit as an example, a kind of special constant-current light adjusting circuit provided by the invention is electric in the special constant-current
On the basis of road, 3rd resistor Rkb, the 4th resistance Rkc and External Control Voltage+Vkc are also added.That is, k-th described special
Also there is the 4th voltage input end Vkc, 3rd resistor Rkb and the 4th resistance Rkc with constant-current circuit.The wherein 3rd resistor
One end of Rkb connects the base stage of the triode Qk, and the other end connects the source electrode of the field-effect tube Tk.4th resistance
One end of Rkc connects the base stage of the triode Qk, and the other end connects the 4th voltage input end Vkc.Pass through the 4th voltage
Input terminal Vkc can control the size of LED operation electric current, to realize light modulation.
From fig. 4, it can be seen that LED current is equal to the drain current of metal-oxide-semiconductor Tk, it is also equal to source current i.e. Rkd electric current, is approximately equal to
Vkd/Rkd (flows through the electric current very little of Rkb, can ignore relative to the electric current for flowing through Rkd), and Vkd injects Qk base stage by Rkb,
The grid that Qk collector is connected to metal-oxide-semiconductor Tk forms negative-feedback circuit, thus the operating current of steady load LEDk；Outside control
Voltage Vkc is also injected into the base stage of triode Qk by Rkc, and the size of Vkc also controls the size of triode Qk base current, then
Metal-oxide-semiconductor Tk grid voltage size is controlled by triode Qk collector, to control metal-oxide-semiconductor Tk drain current i.e. LEDk work electricity
The size of stream.From the above, the operating current of LEDk is mainly determined by resistance Rkd and external voltage Vkc, after Rkd selectes resistance value,
Size by controlling external voltage Vkc can adjust the size of LEDk operating current, to realize light modulation.Simultaneously by
B point injects the function that as aforementioned special constant-current circuit metal-oxide-semiconductor Tk can end and realize controlled switch for sufficiently large electric current
Can, therefore this circuit not only has the function of constant-current dimming circuit, similarly contains aforementioned special constant-current circuit and controlled
The function of switch.
In the n special constant-current circuit, the 4th voltage input end V (k-1) c of kth -1 special constant-current circuit
It is connect with the 4th voltage input end Vkc of k-th of special constant-current circuit.
Below again by taking the linear constant current dimming LED lamp circuit being made of 3 special constant-current light adjusting circuits as an example,
Illustrate the working principle and advantage of linear constant current dimming LED lamp circuit of the present invention.
Fig. 5 is the structural schematic diagram of linear constant current LED lamp circuit specific embodiment two provided by the invention.Referring to Fig. 5,
As a kind of specific embodiment, linear constant current LED lamp circuit provided by the invention includes 3 special constant-current light adjusting circuits, i.e. n
=3.
The working principle of the linear constant current dimming LED lamp circuit are as follows: the light adjusting circuit uses three-level special constant-current tune
Optical circuit, since controlled constant current circuit contains the function of special constant-current circuit, which has aforementioned linear constant-current LED
The function and advantage of circuit for lamp, and due to having used controlled constant current circuit, it can by adjusting External Control Voltage Uc
With light modulation, to realize the function of linear constant current dimming LED lamp.The circuit forms linear constant current by using controlled constant current circuit
Dimming LED lamp realizes the external dimmer of linear constant current LED light, and good dimming effect with relatively simple circuit, to expand
The application range of linear constant current LED light.
One, two and four or more controlled constant current circuit can form linear constant current dimming LED lamp, principle
Ibid, LED string number and the more circuit performances of corresponding constant-current source are better.
In addition, dimming electricity the present invention also provides a kind of special constant-current wifi light adjusting circuit and by the special constant-current wifi
The linear constant current wifi dimming LED lamp circuit of road composition.The special constant-current wifi light adjusting circuit is dimmed in the special constant-current
On the basis of circuit, capacitor Ck, resistance R2k, resistance R5k and resistance R6k are also added.That is, k-th of special constant-current electricity
Road further include: capacitor Ck, resistance R2k, resistance R5k and resistance R6k.One end of the capacitor Ck connects the field-effect tube Tk
Grid, the other end connects the base stage of the triode Qk；One end of the resistance R2k of k-th of special constant-current circuit connects
The emitter of triode Qk, the other end connect the source electrode of the field-effect tube Tk of kth -1 special constant-current circuit；1st institute
The emitter of one end connecting triode Q1 of the resistance R21 of special constant-current circuit is stated, the other end connects the of the rectifier bridge stack
Four connecting pins；One end of the resistance R5k is connect by the 4th resistance Rkc with the base stage of the triode Qk, the other end
It is connect by the second resistance Rkd with the source electrode of the field-effect tube Tk；One end of the resistance R6k passes through the 4th electricity
Resistance Rkc is connect with the base stage of the triode Qk, and the other end is as external voltage input terminal Uk；Kth -1 special constant-current
The external voltage input terminal Uk-1 of circuit is connect with the external voltage input terminal Uk of k-th of special constant-current circuit.
The linear constant current wifi dimming LED lamp circuit being made of the special constant-current wifi light adjusting circuit further include: wifi
Light adjusting circuit；The wifi light adjusting circuit is connect with the external voltage input terminal Uk of the k special constant-current circuits respectively.
The wifi light adjusting circuit specifically includes: wifi light modulator, resistance Rb1-Rb9, photoelectrical coupler, capacitor Cb1-
Cb5, the first operational amplifier and second operational amplifier；
Wherein the first connecting pin of the photoelectrical coupler connects the PWM of the wifi light modulator by the resistance Rb1
Signal output end；The second connection end of the photoelectrical coupler is grounded；The resistance Rb2 is connected in parallel on the of the photoelectrical coupler
Between one connecting pin and second connection end；Shunt capacitance between the third connecting pin and the 4th connecting pin of the photoelectrical coupler
Cb1；One end of the resistance Rb3 connects the 5th voltage input end, and the other end connects the 4th connecting pin of the photoelectrical coupler；
One end of the resistance Rb8 connects the 4th connecting pin of the photoelectrical coupler, and the other end passes through the resistance Rb9 and described the
The first input end of one operational amplifier connects；It is put by the resistance Rb9 and first operation one end of the capacitor Cb3
The first input end connection of big device, the other end are connect with the second input terminal of first operational amplifier；The capacitor Cb4's
One end is connect with the first input end of first operational amplifier, and the third connecting pin of the other end and the photoelectrical coupler connects
It connects；One end of the resistance Rb4 connects the output end of first operational amplifier, and the other end passes through the resistance Rb5 and institute
State the third connecting pin connection of photoelectrical coupler；One end of the resistance Rb7 connects the resistance Rb4, described in other end connection
The first input end of second operational amplifier；Second input terminal of the second operational amplifier passes through the resistance Rb5 and institute
State the third connecting pin connection of photoelectrical coupler；It is second defeated to connect the second operational amplifier for one end of the resistance Rb6
Enter end, the other end connects the output end of the second operational amplifier；One end of the capacitor Cb5 connects second operation and puts
The output end of big device, other end ground connection；The output end of the second operational amplifier and k-th special constant-current circuit it is outer
Portion's voltage input end Uk connection.
The linear constant current dimming LED lamp circuit to be made of 3 special constant-current wifi light adjusting circuits again below
For, illustrate the working principle and advantage of linear constant current dimming LED lamp circuit of the present invention.
Fig. 6 is the structural schematic diagram of linear constant current LED lamp circuit specific embodiment three provided by the invention.Referring to Fig. 6,
As a kind of specific embodiment, linear constant current dimming LED lamp circuit provided by the invention includes 3 special constant-current wifi light modulations
Circuit, i.e. n=3.In Fig. 6, the linear constant current dimming LED lamp circuit is constituted linearly using special constant-current wifi light adjusting circuit
Constant current LED lamp, and be special constant-current wifi by wifi light modulator, optocoupler and by pulsewidth-electric pressure converter that amplifier forms
Light adjusting circuit provides control voltage, realizes wifi light modulation, constitutes complete linear constant current light adjusting circuit.
As it can be seen that the linear constant current LED for proposing special constant-current circuit, being made of special constant-current circuit of the invention
Circuit for lamp, special constant-current light adjusting circuit and the linear constant current dimming LED lamp circuit being made of special constant-current light adjusting circuit, it is dedicated
The continuous current size of constant-current dimming circuit is controlled by external voltage.And use the linear constant current dimming LED (Light Emitting Diode) of the circuit design
Lamp can realize the external dimmers modes such as wifi light modulation or 0-10V, realize wifi light modulation and 0-10V etc. for linear constant current LED light
External dimmer proposes a kind of novel solution.
Linear constant current LED lamp circuit provided by the invention is made of multistage special constant-current circuit, route is simple, without
Complicated Switching Power Supply power supply, several groups of LED, which change concatenated LED quantity by special constant-current circuit, fits LED total voltage automatically
It answers the height of input voltage to change and steady operation, High Power Factor, low harmony wave and high photosynthetic efficiency is realized using simple structure
The advantages of, and control circuit and LED lamp bead can integrative installation technology, solve poor normal linear constant current LED lamp performance, low efficiency,
The problem that light efficiency is low, power factor (PF) is low, harmonic wave is high.The LED light being made into using circuit of the present invention also has external wifi well
Light modulation and 0-10V dimming effect can easily realize cell phone application intelligent dimming using wifi light modulation, can pass through mobile phone
Brightness, color and the spectrum of linear adjustment constant current LED lamp have extensively in lighting of home, commercial lighting and plant illumination field
Purposes.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with it is other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention.In actual design, chip interior needs level
Isolation circuit, each pin can be connected with the metal-oxide-semiconductor of varying level, and can control the closing and conducting of these metal-oxide-semiconductors.Each electricity
Pressure, current detecting point equally will also carry out level isolation, could complete various detection functions as normal circuit.Meanwhile
For those of ordinary skill in the art, according to the thought of the present invention, can have change in specific embodiments and applications
Become place.In conclusion the contents of this specification are not to be construed as limiting the invention.
Claims (8)
1. a kind of linear constant current LED lamp circuit characterized by comprising n special constant-current circuit；Wherein, k-th it is described specially
There is first voltage input terminal Vka and second voltage input terminal Vkb with constant-current circuit；K-th of special constant-current circuit include
Metal-oxide-semiconductor Tk, triode Qk, first resistor Rka, second resistance Rkd and LED light LEDk；In the n special constant-current circuit,
The cathode of the LED light LEDk-1 of kth -1 special constant-current circuit and the second voltage of k-th of special constant-current circuit are defeated
Enter Vkb is held to connect；First voltage input terminal V (k-1) a and k-th of special constant-current of kth -1 special constant-current circuit
The first voltage input terminal Vka connection of circuit；The source electrode of the metal-oxide-semiconductor Tk-1 of kth -1 special constant-current circuit and k-th of institute
State emitter and the second resistance Rkd connection of the triode Qk of special constant-current circuit；The of kth -1 special constant-current circuit
The resistance value of two resistance R (k-1) d is greater than the resistance value of the second resistance Rkd of k-th of special constant-current circuit；Wherein 1≤k≤n；
In k-th of special constant-current circuit, the anode of the LED light LEDk connects the second voltage input terminal Vkb, cathode
Connect the drain electrode of the metal-oxide-semiconductor Tk；One end of the first resistor Rka connects the first voltage input terminal Vka, and the other end connects
Connect the grid of the metal-oxide-semiconductor Tk；One end of the second resistance Rkd connects the source electrode of the metal-oxide-semiconductor Tk, described in other end connection
The emitter of triode Qk；The collector of the triode Qk connects the grid of the metal-oxide-semiconductor Tk；The base stage of the triode Qk
Connect the source electrode of the metal-oxide-semiconductor Tk；
K-th of special constant-current circuit also has the 4th voltage input end Vkc；And k-th of special constant-current circuit also wraps
It includes: 3rd resistor Rkb and the 4th resistance Rkc；Wherein one end of the 3rd resistor Rkb connects the base of the triode Qk
Pole, the other end connect the source electrode of the metal-oxide-semiconductor Tk；One end of the 4th resistance Rkc connects the base stage of the triode Qk, separately
One end connects the 4th voltage input end Vkc；The work electricity of the LED light LEDk is controlled by the 4th voltage input end Vkc
The size of stream, to realize light modulation；
The electric current of the LED light LEDk is equal to the drain current of the metal-oxide-semiconductor Tk, is also equal to the source current of the metal-oxide-semiconductor Tk,
Flow through the electric current of the second resistance Rkd；The size of current for flowing through the second resistance Rkd is equal to tertiary voltage input terminal
The ratio of the resistance of the voltage of Vkd and the second resistance Rkd；The electric current very little of the 3rd resistor Rkb is flowed through, therefore is flowed through
The electric current of the 3rd resistor Rkb can be ignored relative to the electric current for flowing through the second resistance Rkd；Vkd passes through 3rd resistor
Rkb injects the base stage of the triode Qk, and the grid that the collector of the triode Qk is connected to the metal-oxide-semiconductor Tk forms negative anti-
Current feed circuit, thus the operating current of steady load LEDk；External Control Voltage Vkc is also injected into institute by the 4th resistance Rkc
The base stage of triode Qk is stated, the size of Vkc also controls the size of triode Qk base current, then passes through triode Qk collector
Metal-oxide-semiconductor Tk grid voltage size is controlled, to control the metal-oxide-semiconductor Tk drain current i.e. size of LEDk operating current；As it can be seen that described
The operating current of LED light LEDk is mainly determined that second resistance Rkd selectes resistance value by second resistance Rkd and External Control Voltage Vkc
Afterwards, the size of LEDk operating current can be adjusted by controlling the size of External Control Voltage Vkc, to realize light modulation.
2. linear constant current LED lamp circuit according to claim 1, which is characterized in that k-th of special constant-current circuit is also
It include: tertiary voltage input terminal Vkd；The base stage of the triode Qk is connect with the tertiary voltage input terminal Vkd.
3. linear constant current LED lamp circuit according to claim 2, which is characterized in that the linear constant current LED lamp circuit is also
It include: rectifier bridge stack；
First connecting pin of the rectifier bridge stack is connect with electric main firewire incoming end；The second connection end of the rectifier bridge stack
It is connect with the second voltage input terminal V1b of first special constant-current circuit in the n special constant-current circuit；The rectifier bridge
The third connecting pin of heap is connect with electric main zero curve incoming end；4th connecting pin of the rectifier bridge stack is described special with the 1st
With the emitter connection of the triode Q1 of constant-current circuit.
4. linear constant current LED lamp circuit according to claim 3, which is characterized in that the linear constant current LED lamp circuit is also
It include: fuse and varistor；
One end of the fuse connects the electric main firewire incoming end, and the other end connects the first company of the rectifier bridge stack
Connect end；One end of the varistor connects the first connecting pin of the rectifier bridge stack, and the other end connects the rectifier bridge stack
Third connecting pin.
5. linear constant current LED lamp circuit according to claim 4, which is characterized in that in the n special constant-current circuit,
The 4th electricity of 4th voltage input end V (k-1) c of kth -1 special constant-current circuit and k-th of special constant-current circuit
Press input terminal Vkc connection.
6. linear constant current LED lamp circuit according to claim 5, which is characterized in that k-th of special constant-current circuit is also
It include: capacitor Ck, resistance R2k, resistance R5k and resistance R6k；
One end of the capacitor Ck connects the grid of the metal-oxide-semiconductor Tk, and the other end connects the base stage of the triode Qk；K-th
The emitter of one end connecting triode Qk of the resistance R2k of the special constant-current circuit, other end connection kth -1 are described dedicated
The source electrode of the metal-oxide-semiconductor Tk-1 of constant-current circuit；One end connecting triode Q1's of the resistance R21 of the 1st special constant-current circuit
Emitter, the other end connect the 4th connecting pin of the rectifier bridge stack；One end of the resistance R5k passes through the 4th resistance
Rkc is connect with the base stage of the triode Qk, and the other end is connect by the second resistance Rkd with the source electrode of the metal-oxide-semiconductor Tk；
One end of the resistance R6k is connect by the 4th resistance Rkc with the base stage of the triode Qk, and the other end is as external electrical
Press input terminal Uk；The external voltage input terminal Uk-1 and k-th of special constant-current circuit of kth -1 special constant-current circuit
The Uk connection of external voltage input terminal.
7. linear constant current LED lamp circuit according to claim 6, which is characterized in that the linear constant current LED lamp circuit is also
It include: wifi light adjusting circuit；The wifi light adjusting circuit external voltage input terminal Uk with the k special constant-current circuit respectively
Connection.
8. linear constant current LED lamp circuit according to claim 7, which is characterized in that the wifi light adjusting circuit includes:
Wifi light modulator, resistance Rb1-Rb9, photoelectrical coupler, capacitor Cb1-Cb5, the first operational amplifier and the second operation amplifier
Device；
Wherein the first connecting pin of the photoelectrical coupler connects the pwm signal of the wifi light modulator by the resistance Rb1
Output end；The second connection end of the photoelectrical coupler is grounded；The resistance Rb2 is connected in parallel on the first company of the photoelectrical coupler
It connects between end and second connection end；Shunt capacitance Cb1 between the third connecting pin and the 4th connecting pin of the photoelectrical coupler；Institute
The one end for stating resistance Rb3 connects the 5th voltage input end, and the other end connects the 4th connecting pin of the photoelectrical coupler；The electricity
One end of resistance Rb8 connects the 4th connecting pin of the photoelectrical coupler, and the other end passes through the resistance Rb9 and first operation
The first input end of amplifier connects；One end of the capacitor Cb3 passes through the resistance Rb9 and first operational amplifier
First input end connection, the other end are connect with the second input terminal of first operational amplifier；One end of the capacitor Cb4 with
The first input end of first operational amplifier connects, and the other end is connect with the third connecting pin of the photoelectrical coupler；Institute
The one end for stating resistance Rb4 connects the output end of first operational amplifier, and the other end passes through the resistance Rb5 and the photoelectricity
The third connecting pin of coupler connects；One end of the resistance Rb7 connects the resistance Rb4, other end connection second fortune
Calculate the first input end of amplifier；Second input terminal of the second operational amplifier passes through the resistance Rb5 and the photoelectricity
The third connecting pin of coupler connects；One end of the resistance Rb6 connects the second input terminal of the second operational amplifier, separately
One end connects the output end of the second operational amplifier；One end of the capacitor Cb5 connects the second operational amplifier
Output end, other end ground connection；The external voltage of the output end of the second operational amplifier and k-th of special constant-current circuit
Input terminal Uk connection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810651967.4A CN108601158B (en) | 2018-06-22 | 2018-06-22 | A kind of linear constant current LED lamp circuit |
| US16/128,921 US10517151B1 (en) | 2018-06-22 | 2018-09-12 | Linear constant-current LED light circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810651967.4A CN108601158B (en) | 2018-06-22 | 2018-06-22 | A kind of linear constant current LED lamp circuit |
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| CN108601158A CN108601158A (en) | 2018-09-28 |
| CN108601158B true CN108601158B (en) | 2019-11-29 |
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|---|---|---|---|
| CN201810651967.4A Active CN108601158B (en) | 2018-06-22 | 2018-06-22 | A kind of linear constant current LED lamp circuit |
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| US (1) | US10517151B1 (en) |
| CN (1) | CN108601158B (en) |
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| CN110944432A (en) * | 2019-12-16 | 2020-03-31 | 华帝股份有限公司 | LED lamp constant current output circuit with over-temperature detection function and over-temperature detection method |
| CN111065189B (en) * | 2019-12-16 | 2022-04-26 | 华帝股份有限公司 | LED linear constant current circuit with overvoltage detection function and overvoltage detection method |
| CN110996435A (en) * | 2019-12-16 | 2020-04-10 | 华帝股份有限公司 | LED lamp constant current output circuit with self-protection function and constant current control method |
| CN110996458B (en) * | 2019-12-16 | 2022-02-22 | 华帝股份有限公司 | Matrix LED lamp constant current control circuit and constant current control method based on double triodes |
| CN214960211U (en) * | 2021-06-28 | 2021-11-30 | 东莞市光谱光电照明有限公司 | Discrete component linear circuit of circuit |
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| KR100941510B1 (en) * | 2009-07-01 | 2010-02-10 | 주식회사 실리콘마이터스 | Led light emitting device and driving method thereof |
| KR102082451B1 (en) * | 2011-01-28 | 2020-04-14 | 서울반도체 주식회사 | Led driving circuit |
| JP2013004587A (en) * | 2011-06-13 | 2013-01-07 | Brintz Technologie Co Ltd | Led drive circuit |
| CN203167384U (en) * | 2013-04-09 | 2013-08-28 | 青海聚能达新能源开发有限公司 | AC directly driving LED lamp current control circuit |
| CN203301820U (en) * | 2013-06-07 | 2013-11-20 | 陕西亚成微电子股份有限公司 | Linear high-voltage LED (Light Emitting Diode) drive circuit |
| CN105282929B (en) * | 2015-10-20 | 2018-04-27 | 晨辉光宝科技有限公司 | A kind of full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode |
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| US20190394843A1 (en) | 2019-12-26 |
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